551111 has 4 divisors (see below), whose sum is σ = 601224. Its totient is φ = 501000.

The previous prime is 551107. The next prime is 551113. The reversal of 551111 is 111155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551111 - 2² = 551107 is a prime.

It is a Duffinian number.

551111 is a modest number, since divided by 1111 gives 55 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25040 + ... + 25061.

It is an arithmetic number, because the mean of its divisors is an integer number (150306).

2⁵⁵¹¹¹¹ is an apocalyptic number.

551111 is a deficient number, since it is larger than the sum of its proper divisors (50113).

551111 is a wasteful number, since it uses less digits than its factorization.

551111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50112.

The product of its digits is 25, while the sum is 14.

The square root of 551111 is about 742.3685068751. The cubic root of 551111 is about 81.9872575877.

Adding to 551111 its reverse (111155), we get a palindrome (662266).

The spelling of 551111 in words is "five hundred fifty-one thousand, one hundred eleven".